Ceremony, a relatively small work in earth, ink and charcoal on paper, will go to auction at Bonham’s in Sydney on Tuesday night. The picture was created by Wurundjeri elder Barak – known by some in the Aboriginal community as “Uncle William” or “Grandfather” – in 1897. It was exchanged by its creator for a glass work by English craftsman Frank Piggott Webb, and has remained with Webb’s descendants until now.